how to query core data object with specific attribute value

Question

I have a core data entity with many attributes and I need to be able to access them based on the value of one attribute. For example I have an attribute "Trip" and I need to be able to access the values of the others based on the value of "Trip". So I need to fetch all the values for any object that has a "Trip" value of 1. How do I go about specifying this in the code?

Did you have a look at "Fetching Managed Objects" in the "Core Data Programming Guide" ? — Martin R
– Martin R, Commented Mar 12, 2014 at 18:58

sergio · Accepted Answer · 2014-03-12 18:57:37Z

1

Pretty basic question. You can use a NSFetchRequest:

NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"trip == %@", yourTrip];
[request setEntity:[NSEntityDescription entityForName:@"Trips" inManagedObjectContext:moc]];
[request setPredicate:predicate];

NSError *error = nil;
NSArray *results = [moc executeFetchRequest:request error:&error];

answered Mar 12, 2014 at 18:57

sergio

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